Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88a8b8a79cd5ab8…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 14:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a12b9f03f8db7cdc27a51ff2bdb7f9c SHA-1: a223d2689b917a7be95880cd03f320bdd5423bea SHA-256: b88a8b8a79cd5ab82536036ac28d7aea8c95eefacfe3ef0810849df4690f50fe
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous links to external websites. The heuristic firings indicate it is a redirector link farm and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=irrational+numbers+worksheet+pdf In PDF document text
    • https://cdn.sqhk.co/gazegarov/hhfaub7/90512819458.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/cd19c1366832f.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/geihucq/mexican_football_players_in_england.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/judikunijotuzu.pdfIn PDF document text
    • https://merelakududeva.weebly.com/uploads/1/3/2/3/132303156/2580261.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/V0Ahbic/68549425384.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/2f4b171885a4f6e.pdfIn PDF document text
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/tarikulisajakug-zaloz-dimoref-zemesem.pdfIn PDF document text
    • https://mujeganivavubu.weebly.com/uploads/1/3/1/4/131406781/39031b.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/ajfDpjc/carnival_city_informally_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/lgcwQhf/mens_stacked_pants_wholesale.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/RrUqgjt/deus_ex_gog_or_steam.pdfIn PDF document text
    • https://sofivowipaduru.weebly.com/uploads/1/3/4/4/134454637/pibuzewozope.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/mavijarofoziropaka.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/fogefuwitedomunuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/ijfgh32/41321594637.pdfIn PDF document text
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/4752812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaruxokogidut.epizy.com/reading_practice_test_ielts_academic.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/bebubitozij.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/moneteludanur.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/dumuwumatoguwebariku.pdfIn PDF document text
    • http://komivarutu.epizy.com/borderlands_3_legendaries_list_spreadsheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 6992 bytes
SHA-256: 05fe73d7e356131391b56f2edaeb0e8c13d7f249ae6ece1834cfc9667ac9778d
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5516 bytes
SHA-256: eab2472e1bfdc4b7e71f07f8f650981215e3cfde7e45cbbb837773939364bab6
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10872 bytes
SHA-256: e8f284bc44e6726412fe57c53f9b27a3bc6d5578de5ab3907707999ac4ad354c
font_03_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 16212 bytes
SHA-256: ac61dfd76fff4f340a86712959c90cb34f96c608fbb449cffea6762ccded4840

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